Fake products. Review on Amazon

Amazon.in is one of the leading online shopping website of India and I did shopping from Amazon so many times my previous experience was good but my recent experience was really bad. I ordered a mi power bank through Amazon.in ( the dealer's name is b2b bothers) . Power bank delivered after 5 days and when I checked it was not working when I raised a request for returning the product but they told me to send the product by myself and I have to bear the charges. B2b bothers are giving the power bank in 439 rupees ( the actual price of that power bank is about 1500 rupees ) actually b2b bothers are delivering duplicate material and people who are lazy they don't return the product by thinking like they have to pack the product and they they need to send it to the dealer so they think leave 489 rupees and that is how b2b bothers are making money and Amazon is not caring about their policy to deliver original product. I will not recommend to shop from Amazon